基于QDCT全局均分策略的鲁棒视频水印方案  

Robust Video Watermarking Scheme Based on QDCT Global Equalization Strategy

作　　者：陶新宇 熊礼治 张翔[1,3] TAO Xinyu;XIONG Lizhi;ZHANG Xiang(Engineering Research Center of Digital Forensics Ministry of Education(Nanjing University of Information Science and Technology),Nanjing 210044,China;School of Software,Nanjing University of Information Science and Technology,Nanjing 210044,China;School of Computer Science,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]数字取证教育部工程研究中心(南京信息工程大学),南京210044 [2]南京信息工程大学软件学院,南京210044 [3]南京信息工程大学计算机学院、软件学院、网络空间安全学院,南京210044

出　　处：《计算机科学》2023年第11期168-176,共9页Computer Science

基　　金：国家自然科学基金(62172233);国家重点研发计划(2021YFB00900)。

摘　　要：视频水印作为一种应用前景广阔的版权保护技术,近年来受到了广泛关注。与原始域方案不同,压缩域方案不需要完全编解码视频,具有更高的效率;并且视频存储和传输一般需要经过压缩编码才能进行,使得压缩域的鲁棒视频水印方案成为了研究热点。但现有的压缩域方案大多利用压缩域中的QDCT系数个体来嵌入水印,使得算法的鲁棒性不高。为了增加压缩域算法的鲁棒性,文中提出了一种基于QDCT全局均分策略的鲁棒视频水印方案。首先,利用非零系数个数选出视频中兼具纹理和高空间复杂度的块作为水印块,将两块水印块组成块对;然后,分别计算出块对中所有系数的总和,根据系数总和的大小以及水印信息,通过全局均分策略修改后序块内所有非零系数的幅值,来满足方案设置的块对系数和规则,以实现水印的嵌入。实验结果表明,在保证含水印视频具有较高视觉质量的前提下,该方案抵抗重压缩攻击和噪声攻击的鲁棒性均优于现有压缩域的鲁棒视频水印方案,分别提高了8%,9%。As a promising technology of copyright protection,video watermarking has attracted more and more attention in recent years.Different from the original domain scheme,the compressed domain scheme does not need to fully encode and decode video,so it has higher efficiency,and the video storage and transmission generally need to be compressed and encoded.Therefore,robust video watermarking scheme in compressed domain become a research hotspot.However,most of the existing schemes in the compressed domain use the individual QDCT coefficients in the compressed domain to embed the watermark,which makes the algorithm less robust.In order to improve the robustness of the compressed domain algorithm,a robust video watermarking scheme based on the QDCT global equalization strategy is proposed in this paper.Firstly,the blocks with both texture and high spatial complexity are selected as watermark blocks by using the number of non-zero coefficients,and then the sum of all coefficients in the two blocks is calculated respectively.According to the sum of the coefficients and the watermark information,all the non-zero coefficients in the sequence block are modified by the global equalization strategy to satisfy the block-pair coefficients rule,and the watermark is embedded.Experimental results show that the robust performance of the proposed scheme is better than that of the existing robust video watermarking scheme in resisting both recompression and noise attacks,increases by 8%and 9%respectively,while ensuring the high visual quality of the watermark-containing video.

关 键 词：视频水印 鲁棒水印 H.264编解码 重压缩攻击 均分策略 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]